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Understanding 4 to 20 mA Loops

David A. Snyder, PE

This course familiarizes the reader with the uses and limitations of 4 to 20 mA current loops, which are used in the majority of analog input and analog output loops in almost every industrial facility. This course is written in a simple, easy-to-understand format, uses basic math calculations, and includes more than 80 illustrations and dozens of examples. This course shows how process parameters such as temperature, pressure, level, and flow are represented by 4 to 20 mA analog input signals and how a modulating valve’s liquid flow coefficient (Cv) is controlled by 4 to 20 mA analog output signals for quick-opening, linear, and equal-percentage modulating control valves. This course also describes how one measured parameter, such as pressure, can be used to infer another parameter, such as level or flow.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.